Kwame defends power lowpost players better, and shows better on the PnR. Gasol's a bit clumbsy when showing on PnR's, and often over shoots allowing guards that are looking to drive to get around him anyway. Gasol's has more length and better decision making, making him a better rebounder, weakside shot blocker, and more effective at recovering to big man shooters and having some impact with his length on the shots being taken.

The reason why Kwame was a number 1 pick was mainly because of his body. He has the body of a prime-aged Karl Malone, but the problem is he doesn't know how to use it offensively. This also explains why he's so good at defense. If you have a big body like Kwame, it doesn't take much to play defense. You just need to have quick feet and stay infront of whoever your guarding and that's exactly what Kwame does. Gasol doesn't have that much strength compared to Kwame, the only thing he has defensively is his length.